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    • Received: Sep. 8, 2020

    Accepted: Dec. 19, 2020

    Posted: Mar. 30, 2021

    Published Online: Apr. 2, 2021

    The Author Email: Qiuping Huang (qphuang@ustc.edu.cn), Yalin Lu (yllu@ustc.edu.cn)

    DOI: 10.3788/COL202119.073602

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    Yi Zhao, Qiuping Huang, Honglei Cai, Xiaoxia Lin, Hongchuan He, Hao Cheng, Tian Ma, Yalin Lu. Ultrafast control of slow light in THz electromagnetically induced transparency metasurfaces[J]. Chinese Optics Letters, 2021, 19(7): 073602

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    • Nanophotonics, Metamaterials, and Plasmonics
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Chinese Optics Letters, Vol. 19, Issue 7, 073602 (2021)

Ultrafast control of slow light in THz electromagnetically induced transparency metasurfaces

Yi Zhao1, Qiuping Huang1,2,*, Honglei Cai1, Xiaoxia Lin1, Hongchuan He3, Hao Cheng3, Tian Ma2, and Yalin Lu1,2,3,**

Author Affiliations

  • 1Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, Hefei 230026, China
  • 2Anhui Laboratory of Advanced Photon Science and Technology, University of Science and Technology of China, Hefei 230026, China
  • 3Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China

Abstract

In this paper, we experimentally demonstrate ultrafast optical control of slow light in the terahertz (THz) range by combining the electromagnetically induced transparency (EIT) metasurfaces with the cut wire made of P+-implanted silicon with short carrier lifetime. Employing the optical-pump THz-probe spectroscopy, we observed that the device transited from a state with a slow light effect to a state without a slow light effect in an ultrafast time of 5 ps and recovered within 200 ps. A coupled oscillator model is utilized to explain the origin of controllability. The experimental results agree very well with the simulated and theoretical results. These EIT metasurfaces have the potential to be used as an ultrafast THz optical delay device.

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